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Again, Satcomer writes the truth.
However, due to general stupidity, I have created some of the problems you have described without a HD failure--like . . . trying the "Network Disk" and spending an hour trying to get the Mac to boot! So, ASSUMING you have backed everything up, you may just have to bite the bullet and reformat the HD.
If your HD is old, though that is the best guess. Disk Warrior allowed me to take "pictures" of a failing HD which I then use to save data before the inevitable death.
Another thing to consider is your RAM. When one of my RAM chips started failing I got really weird things including kernal panics. However, it would progressively destroy my volumes until I got, like you, an unrecognizable and useless Start Up disk. In reality, this would happen "suddenly." However, if I checked out the computer in between, I found volume errors TT would have difficulty fixing--like you.
. . . and . . . by the way, TT memory test will not reveal RAM that is failing as opposed to "FAIL." There is a cheap shareware that tests such things--it is like $1.37 or something that did immediately diagnose the problem. Not saying you DO have failing RAM . . . I would bet on dying HD and/or FUBAR'd OS.
--J.D.
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